Double fan blade



FIG. 1 is a side perspective of a double fan blade showing my new design;

FIG. 2 is a side perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a side elevation view thereof; and,

FIG. 6 is a side perspective view thereof.

The broken lines in drawing FIGS. 1-2 depict environmental subject matter. The broken lines in drawing FIGS. 3-6 illustrate portions of the double fan blade that form no part of the claimed design. 

CLAIM The ornamental design for a double fan blade, as shown and described. 